<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 1. 数组方法回调
        // let arr = [1,2,3];

        // console.log("start");

        // arr.forEach((item)=>{
        //     console.log(item);
        // })

        // console.log("end");
        // 2. promise的excutor函数 excutor
        // new Promise((resolve,reject)=>{
        //     console.log(123);
        // });

        // console.log("end");
    </script>
</body>

</html>